Manhole adjusting extension ring section

Abstract

A molded plastic extension member for use in increasing the height of manholes, or catch basins when surfacing or resurfacing a roadway is described. A wedge to adjust the angle of the catch basin support frame or the manhole cover support frame is also described. The extension includes a pocket for reducing the total surface area of the molded plastic member. It also includes a shoulder that interlocks with either the manhole cone, the catch basin cone, or with other stackable molded plastic members. The extension also contains a planer support surface which provides rigidity and support, and provides a surface for caulking to be applied to form a watertight seal.

What is claimed is: 
     
       1. An extension for use in manhole construction which comprises: a molded plastic member having a shape conforming to the manhole construction, and further having a first (outer) and second (inner) concentric, spaced-apart, walls interconnected by a plurality of webs extending from said first and second walls to create a corresponding plurality of pocket spaces, said second wall having an upper and a lower section laterally offset in opposite directions relative to a center section to define an upper and a lower shoulder extending from said center section.   
     
     
       2. An extension as recited in claim 1 wherein at least one of said first and second concentric spaced-apart walls having a planar support surface extending perpendicularly from an upper edge thereof, to provide a surface of support. 
     
     
       3. An extension as recited in claim 1 wherein said webs are constructed in a geometric shape selected from the group consisting of: a square, a rectangle, an ellipse, a semi circle, an oval, a cylinder, a triangle, a sphere, and any combination of the above. 
     
     
       4. An extension as recited in claim 1 wherein said molded plastic member is a continuous concentric member conforming to the manhole construction. 
     
     
       5. An extension as recited in claim 1 wherein said molded plastic member is a segmented concentric member having interlocking means, such that an aligned and engaged plurality of said segmented concentric members conform to the manhole construction. 
     
     
       6. Apparatus for changing the spacing between a top surface surrounding an access opening of a cone of a manhole or catch basin having concentric inner and outer walls defining said top surface and a support frame designed to rest on said top surface prior to the surfacing or resurfacing of a street in which said manhole or catch basin is located, so that a cover or grating supported by said support frame will be flush with the level of the surfaced or resurfaced street, comprising: a molded plastic member having concentrically disposed inner and outer wall members of a predetermined height dimension maintained in parallel spaced relation by a plurality of regularly spaced webs that link said inner and outer walls to define a plurality of pockets therebetween, at least one of said inner and outer walls of said molded plastic member including an offset segment for engaging one of said inner and outer walls of said cone, said webs being of a length to position the other of said first and second walls in approximate alignment with the other of said inner and outer walls of said cone; at least one of said inner and outer walls of said molded plastic member having a flange extending from an upper edge thereof, to provide a surface of support for the support frame.   
     
     
       7. The apparatus of claim 6 and further including a molded plastic wedge member having a thickness dimension that slopes uniformly across the length dimension thereof from a first height dimension to a second height dimension, said wedge member dimensioned to rest atop the top surface surrounding the access opening of the cone and directly beneath said web of said molded plastic member. 
     
     
       8. A device as recited in claim 6 wherein said inner and outer wall predetermined height dimension is in a range from 11/2 inches to 3 inches. 
     
     
       9. A device as recited in claim 6 wherein said molded plastic member is comprised of recycled plastic. 
     
     
       10. A device as recited in claim 6 wherein said inner wall member includes an upper and a lower section radially offset relative to a center section to define an upper and a lower shoulder extending from said center section, wherein said lower shoulder is aligned and engaged with a portion of the top surface, and adjacent to the inner wall of said cone. 
     
     
       11. A device as recited in claim 6 wherein said inner wall member includes an upper and a lower section radially offset relative to a center section to define an upper and a lower shoulder extending from said center section, wherein said lower shoulder is aligned and engaged with an upper shoulder of a second molded plastic member when two such molded plastic members are stacked one atop the other. 
     
     
       12. A device as recited in claim 6 wherein said webs are constructed in a geometric shape selected from the group consisting of: a square, a rectangle, an ellipse, a semi circle, an oval, a cylinder, a triangle, a sphere, and any combination of the above. 
     
     
       13. A device as recited in claim 6 wherein said molded plastic member is a continuous concentric member conforming to the access opening of the cone. 
     
     
       14. A device as recited in claim 6 wherein said molded plastic member is a segmented concentric member having an interlocking means, such that an aligned and engaged plurality of said segmented concentric members conform to the access opening of the cone. 
     
     
       15. A spacer member adapted to be disposed between an access opening in a top surface of a manhole or catch basin cone and a support frame comprising: a molded plastic member with inner and outer vertical walls extending between first and second major surfaces, said member having a plurality of spaced apertures extending perpendicular to said first and second major surfaces, said plastic member being aligned and engaged with the top surface of the cone; said second major surface supporting the support frame; said plastic member having a relatively equal height throughout.   
     
     
       16. A device as recited in claim 15 in which said plastic member is approximately two inches thick. 
     
     
       17. A device as recited in claim 15 in which said inner vertical wall further comprises an upper and lower section radially offset relative to a center section to define an upper and a lower shoulder thereon, wherein said lower shoulder being aligned and engaged with a portion of the top surface surrounding the access opening of the cone. 
     
     
       18. A device as recited in claim 15 in which said inner vertical wall further comprises an upper and lower section radially offset relative to a center section to define an upper and a lower shoulder thereon, wherein said lower shoulder being aligned and engaged with the upper shoulder of an additional plastic member when a pair of plastic members are stacked one atop the other. 
     
     
       19. A device as recited in claim 15 in which said spaced apertures are positioned symmetrically about said plastic annular member. 
     
     
       20. A device as recited in claim 15 in which said plastic annular member is comprised of recycled plastic. 
     
     
       21. A spacer member adapted to be disposed between an open top surface of a cone of a manhole or catch basin and a support frame comprising: a molded plastic member having a first (outer) and second (inner) concentric, spaced-apart, vertical walls interconnected by a plurality of radially extending webs to create a corresponding plurality of pocket spaces, at least one of said first and second vertical walls having a lip extending perpendicularly from an upper edge thereof, to provide a support surface for the support frame, and said second vertical wall having an upper and lower section radially offset relative to a center section to define an upper and a lower shoulder thereon, wherein said lower shoulder is aligned and engaged with the inner edge of the open top surface.   
     
     
       22. A spacer member as recited in claim 21 in which said plastic member has a thickness in the range from 11/2 to 3 inches. 
     
     
       23. A spacer member as recited in claim 21 in which said plastic member is comprised of recycled plastic. 
     
     
       24. A spacer member as recited in claim 21 and further including a molded plastic wedge member having a thickness dimension that slopes uniformly across the length dimension thereof from a first height dimension to a second height dimension, said wedge member dimensioned to rest atop the open top surface of the cone and directly beneath said web of said plastic member. 
     
     
       25. A spacer member as recited in claim 21 wherein said webs are constructed in a geometric shape selected from the group consisting of: a square, a rectangle, an ellipse, a semi circle, an oval, a cylinder, a triangle, a sphere, and any combination of the above. 
     
     
       26. A spacer member as recited in claim 21 wherein said plastic member is a continuous concentric member conforming to the open top surface of the cone. 
     
     
       27. A spacer member as recited in claim 21 wherein said plastic member is a segmented concentric member having an interlocking means, such that an aligned and engaged plurality of said segmented concentric members conforms to the open top surface of the cone. 
     
     
       28. A spacer member as recited in claim 21 in which said plastic member is further molded in a rectangular plastic member. 
     
     
       29. A spacer member adapted to be disposed between an open top surface of a cone of a manhole or catch basin and a support frame comprising: a molded plastic member having a first (outer) and second (inner) concentric, spaced-apart, vertical walls interconnected by a plurality of radially extending webs to create a corresponding plurality of pocket spaces, at least one of said first and second vertical walls having a lip extending perpendicularly from an upper edge thereof, to provide a planar support surface for said support frame; said second vertical wall having an upper and lower section radially offset relative to a center section to define an upper and a lower shoulder thereon, wherein said lower shoulder may be aligned and engaged with an upper shoulder of a second molded plastic member.   
     
     
       30. A device as recited in claim 29 in which said plastic member has a thickness in the range from 11/2 to 3 inches. 
     
     
       31. A device as recited in claim 29 in which said plastic member is comprised of recycled plastic. 
     
     
       32. A device as recited in claim 29 and further including a molded plastic wedge member having a thickness dimension that slopes uniformly across the length dimension thereof from a first height dimension to a second height dimension, said wedge member dimensioned to rest atop said open top surface of said cone and directly beneath said web of said molded plastic member. 
     
     
       33. A device as recited in claim 29 wherein said webs are constructed in a geometric shape selected from the group consisting of: a square, a rectangle, an ellipse, a semi circle, an oval, a cylinder, a triangle, a sphere, and any combination of the above. 
     
     
       34. A device as recited in claim 29 wherein said molded plastic member is a continuous concentric member conforming to the open top surface of the cone. 
     
     
       35. A device as recited in claim 29 wherein said molded plastic member is a segmented concentric member having an interlocking means, such that an aligned and engaged plurality of said segmented concentric members conform to the open top surface of the cone. 
     
     
       36. A device as recited in claim 29 in which said plastic member is further molded in a rectangular plastic member.